Here's a little info from the seller when I asked him about any history on this sign...
i bought it from the guy who used to be,or still is the president of the Grapette collectors club by the name of Van Stewart...that was about 5 yrs ago,he told me he had a pair of them and he was selling this one because it had a chip on the edge.....he was always into high-end signs and never sold repops.I'm not aware of that particular sign being reproduced but i know of a smaller one about half that size thats a repop and the back of it is white,thats all i know.
Beginning to set my mind at ease a little...
Thanks for everyone's input!